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Port 1200 (scol)

IANA assigns port 1200 to scol: SCOL.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
scol TCP SCOL Cryo Networks -
scol UDP SCOL Cryo Networks -

Check what is listening on port 1200

Linux: is anything listening on TCP 1200?
sudo ss -tlnp 'sport = :1200'
Linux: UDP 1200
sudo ss -ulnp 'sport = :1200'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1200
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1200 '
Windows (Command Prompt)
netstat -ano | findstr :1200
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1200 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1200
From Windows
Test-NetConnection HOST -Port 1200
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1200

Block port 1200 in the firewall

ufw
sudo ufw deny 1200/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1200 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1200 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1200' -Direction Inbound -Protocol TCP -LocalPort 1200 -Action Block
ufw
sudo ufw deny 1200/udp
iptables
sudo iptables -A INPUT -p udp --dport 1200 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1200 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1200' -Direction Inbound -Protocol UDP -LocalPort 1200 -Action Block

Related ports

1198cajo-discovery1199dmidi1201nucleus-sand1202caiccipc

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.